Safe OS Dynamic Updates
Recovery environment updates, tracked separately from Windows cumulative and Setup Dynamic Updates.
SafeOS updates service the Windows recovery environment (WinRE) used during recovery and feature updates. They can include security fixes and reliability improvements. A catalog classification of Critical Updates is not a CVE severity rating.
Installation channels, prerequisites, replacement information and the need to update installation media vary by KB. Always check the Microsoft deployment guidance and the relevant support article. This listing does not assess whether a device's WinRE is patched.
Package history
714 packages · 262 KB articles · Last successful refresh: . Automatic discovery every 6 hours. Microsoft Update Catalog source
714 matching packages. Each row is a catalog package; the same KB can apply to multiple versions and architectures.
Release date and package build come from the KB article when available. Catalog revised is Microsoft's catalog revision date, not the original release date. Missing article details are explicitly marked and retried automatically.
| Product / version | Architecture | KB / details | Release date | Catalog revised | Package build | Catalog |
|---|---|---|---|---|---|---|
| Windows 10 21H2 | x64 |
KB5027389
Details2023-06 Dynamic Update for Windows 10 Version 21H2 for x64-based Systems (KB5027389) Classification: Critical Updates. Size: 7.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 10 21H2 | x86 |
KB5027389
Details2023-06 Dynamic Update for Windows 10 Version 21H2 for x86-based Systems (KB5027389) Classification: Critical Updates. Size: 3.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 10 22H2 | arm64 |
KB5027389
Details2023-06 Dynamic Update for Windows 10 Version 22H2 for ARM64-based Systems (KB5027389) Classification: Critical Updates. Size: 8.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 10 22H2 | x64 |
KB5027389
Details2023-06 Dynamic Update for Windows 10 Version 22H2 for x64-based Systems (KB5027389) Classification: Critical Updates. Size: 7.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 10 22H2 | x86 |
KB5027389
Details2023-06 Dynamic Update for Windows 10 Version 22H2 for x86-based Systems (KB5027389) Classification: Critical Updates. Size: 3.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 11 | arm64 |
KB5027572
Details2023-06 Dynamic Update for Windows 11 for ARM64-based Systems (KB5027572) Classification: Critical Updates. Size: 4.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 11 | x64 |
KB5027572
Details2023-06 Dynamic Update for Windows 11 for x64-based Systems (KB5027572) Classification: Critical Updates. Size: 3.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5027573
Details2023-06 Safe OS Dynamic Update for Windows 11 Version 22H2 for arm64-based Systems (KB5027573) Classification: Critical Updates. Size: 3.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5027573
Details2023-06 Safe OS Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5027573) Classification: Critical Updates. Size: 2.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-06-13 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5023527
Details2023-02 Dynamic Update for Windows 11 Version 22H2 for ARM64-based Systems (KB5023527) Classification: Critical Updates. Size: 1.2 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-02-28 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5023527
Details2023-02 Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5023527) Classification: Critical Updates. Size: 0.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-02-28 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5023527
Details2023-02 Safe OS Dynamic Update for Windows 11 Version 22H2 for arm64-based Systems (KB5023527) UUP Classification: Critical Updates. Size: 1.2 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-02-28 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5023527
Details2023-02 Safe OS Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5023527) UUP Classification: Critical Updates. Size: 0.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-02-28 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5022609
Details2023-01 Safe OS Dynamic Update for Windows 11 Version 22H2 for arm64-based Systems (KB5022609) UUP Classification: Critical Updates. Size: 1.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-02-09 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5022609
Details2023-01 Safe OS Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5022609) UUP Classification: Critical Updates. Size: 0.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-02-09 | Not available |
Package / download |
| Windows 10 1507 | x64 |
KB5023290
Details2023-01 Dynamic Update for Windows 10 Version 1507 for x64-based Systems (KB5023290) Classification: Critical Updates. Size: 0.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-01-31 | Not available |
Package / download |
| Windows 10 1507 | x86 |
KB5023290
Details2023-01 Dynamic Update for Windows 10 Version 1507 for x86-based Systems (KB5023290) Classification: Critical Updates. Size: 0.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-01-31 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5022609
Details2023-01 Dynamic Update for Windows 11 Version 22H2 for ARM64-based Systems (KB5022609) Classification: Critical Updates. Size: 1.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-01-26 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5022609
Details2023-01 Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5022609) Classification: Critical Updates. Size: 0.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2023-01-26 | Not available |
Package / download |
| Microsoft server operating system | x64 |
KB5020594
Details2022-11 Dynamic Update for Microsoft server operating system for x64-based Systems (KB5020594) Classification: Critical Updates. Size: 4.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-22 | Not available |
Package / download |
| Microsoft server operating system 22H2 | x64 |
KB5020594
Details2022-11 Dynamic Update for Microsoft server operating system, version 22H2 for x64-based Systems (KB5020594) Classification: Critical Updates. Size: 4.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-22 | Not available |
Package / download |
| Windows 10 1607 | x64 |
KB5021039
Details2022-11 Dynamic Update for Windows 10 Version 1607 for x64-based Systems (KB5021039) Classification: Critical Updates. Size: 8.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 1607 | x86 |
KB5021039
Details2022-11 Dynamic Update for Windows 10 Version 1607 for x86-based Systems (KB5021039) Classification: Critical Updates. Size: 7.9 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 11 | arm64 |
KB5021040
Details2022-11 Dynamic Update for Windows 11 for ARM64-based Systems (KB5021040) Classification: Critical Updates. Size: 3.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 11 | x64 |
KB5021040
Details2022-11 Dynamic Update for Windows 11 for x64-based Systems (KB5021040) Classification: Critical Updates. Size: 2.3 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5021041
Details2022-11 Dynamic Update for Windows 11 Version 22H2 for ARM64-based Systems (KB5021041) Classification: Critical Updates. Size: 1.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5021041
Details2022-11 Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5021041) Classification: Critical Updates. Size: 0.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 1809 | arm64 |
KB5021042
Details2022-11 Dynamic Update for Windows 10 Version 1809 for ARM64-based Systems (KB5021042) Classification: Critical Updates. Size: 0.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 1809 | x64 |
KB5021042
Details2022-11 Dynamic Update for Windows 10 Version 1809 for x64-based Systems (KB5021042) Classification: Critical Updates. Size: 0.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 1809 | x86 |
KB5021042
Details2022-11 Dynamic Update for Windows 10 Version 1809 for x86-based Systems (KB5021042) Classification: Critical Updates. Size: 0.3 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 20H2 | arm64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 20H2 for ARM64-based Systems (KB5021043) Classification: Critical Updates. Size: 3.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 20H2 | x64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 20H2 for x64-based Systems (KB5021043) Classification: Critical Updates. Size: 2.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 20H2 | x86 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 20H2 for x86-based Systems (KB5021043) Classification: Critical Updates. Size: 1.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 21H1 | arm64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 21H1 for ARM64-based Systems (KB5021043) Classification: Critical Updates. Size: 3.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 21H1 | x64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 21H1 for x64-based Systems (KB5021043) Classification: Critical Updates. Size: 2.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 21H1 | x86 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 21H1 for x86-based Systems (KB5021043) Classification: Critical Updates. Size: 1.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 21H2 | arm64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 21H2 for ARM64-based Systems (KB5021043) Classification: Critical Updates. Size: 3.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 21H2 | x64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 21H2 for x64-based Systems (KB5021043) Classification: Critical Updates. Size: 2.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 21H2 | x86 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 21H2 for x86-based Systems (KB5021043) Classification: Critical Updates. Size: 1.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 22H2 | arm64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 22H2 for ARM64-based Systems (KB5021043) Classification: Critical Updates. Size: 3.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 22H2 | x64 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 22H2 for x64-based Systems (KB5021043) Classification: Critical Updates. Size: 2.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 10 22H2 | x86 |
KB5021043
Details2022-11 Dynamic Update for Windows 10 Version 22H2 for x86-based Systems (KB5021043) Classification: Critical Updates. Size: 1.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-11-08 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5018924
Details2022-10 Dynamic Update for Windows 11 Version 22H2 for ARM64-based Systems (KB5018924) Classification: Critical Updates. Size: 0.9 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-10-25 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5018924
Details2022-10 Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5018924) Classification: Critical Updates. Size: 0.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-10-25 | Not available |
Package / download |
| Windows 10 22H2 | arm64 |
KB5012419
Details2022-10 Dynamic Update for Windows 10 Version 22H2 for ARM64-based Systems (KB5012419) Classification: Critical Updates. Size: 3.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-10-18 | Not available |
Package / download |
| Windows 10 22H2 | x64 |
KB5012419
Details2022-10 Dynamic Update for Windows 10 Version 22H2 for x64-based Systems (KB5012419) Classification: Critical Updates. Size: 2.2 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-10-18 | Not available |
Package / download |
| Windows 10 22H2 | x86 |
KB5012419
Details2022-10 Dynamic Update for Windows 10 Version 22H2 for x86-based Systems (KB5012419) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-10-18 | Not available |
Package / download |
| Windows 11 22H2 | arm64 |
KB5017160
Details2022-09 Dynamic Update for Windows 11 Version 22H2 for ARM64-based Systems (KB5017160) Classification: Critical Updates. Size: 0.2 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-09-20 | Not available |
Package / download |
| Windows 11 22H2 | x64 |
KB5017160
Details2022-09 Dynamic Update for Windows 11 Version 22H2 for x64-based Systems (KB5017160) Classification: Critical Updates. Size: 0.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-09-20 | Not available |
Package / download |
| Windows 11 | arm64 |
KB5015021
Details2022-06 Dynamic Update for Windows 11 for ARM64-based Systems (KB5015021) Classification: Critical Updates. Size: 3.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2022-06-23 | Not available |
Package / download |
Programmatic access: GET /api/WindowsVersions/safeos. See API access and authentication.